Rockford Fosgate Speaker PWR 410 User Guide

PO W ER W O O FERS  
PWR-410  
PWR-412  
PWR-415  
PWR-810  
PWR-812  
PWR-815  
O W N ER' S MAN U AL  
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TABLE O F C O N T EN T S  
Punch Power Woofer Contents ......................................................... 1  
Introduction ...................................................................................... 1  
Design Features................................................................................. 1  
Cast Aluminum Basket ................................................................ 1  
Oversized Magnet ....................................................................... 1  
Binding Post Terminals ................................................................ 1  
AeroVent™ Pole Piece ................................................................ 2  
Suspension .................................................................................. 2  
Voice Coil ................................................................................... 2  
Cone ........................................................................................... 2  
Low Frequency Speaker Systems ....................................................... 2  
Using The Punch Power Woofer ....................................................... 2  
Calculating Load Impedance ............................................................. 3  
Calculating Volume .......................................................................... 4  
Building An Enclosure ....................................................................... 4  
Specifications .................................................................................... 5  
Warranty Information ........................................................................ 6  
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PUNCH POW ER W O O FER CONTENTS  
Punch Power Woofer  
Baseplate Label  
IN TRO D U C TI O N  
This manual provides information on the construction, installation  
and operation of the Punch Power Woofers. We suggest you save this  
manual for future reference.  
The Punch Power Woofers incorporate the best available materials in  
an innovative design that achieves solid low frequency performance  
at high levels with outstanding power handling. From the oversized  
magnet for high motor efficiency to the low resonant cast aluminum  
basket no detail has been overlooked in designing the finest low  
frequency speaker available. The materials and construction tech-  
niques which make this possible are listed below.  
D E SI G N FE AT U R E S  
Cast Aluminum Basket – The basket is the supporting structure for the  
speakerand mustnotvibrate orflexwith the speaker'soperation. The  
low resonant cast aluminum basket used on the Punch Power  
Woofers is strong enough to support the large magnet assembly and  
will allow the speaker to operate at low frequencies without sonic  
coloration.  
Oversized Magnet Oversized magnets are used for high efficiency  
and improved power handling. The magnet is protected by an  
attractive rubber cover which can be oriented to match the system  
layout.  
Binding Post Terminals – The amplifier connects to the speaker  
through the use of gold-plated 5-way binding posts. These binding  
posts are versatile connectors which allow for the connection of the  
speakers with a variety of different terminals such as banana plugs or  
spade lugs. The binding post will also accept bare wire up to 12 gauge  
and are spaced on 3/4" centers to accommodate dual banana plugs.  
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AeroVent™ Pole Piece – The AeroVent™ provides ventilation for the  
voice coil for improved power handling. The AeroVent™ is aerody-  
namically shaped to allow passage of large amounts of air without  
constricting the air flow which can cause whistling or turbulence  
noise.  
Suspension – The suspension holds the cone to the basket and  
suspends the voice coil in the magnetic gap. The surround, which  
supports the cone, is made from a dual laminate foam which  
minimizes edge deterioration. The proprietary flat spider design  
maintains linear motion of the voice coil even at high listening levels.  
Voice Coil – The voice coil is wound on a large diameter anodized  
aluminum former for highly efficient thermal transfer. The large  
gauge high temperature copper wire allows operation at high power  
levels.  
Cone – The cone is made of a heavy and rigid paper material which  
allows for very low frequency response and resists deforming when  
driven at high power levels.  
LOW FREQUENCY SPEAKER SYSTEMS  
The Punch Power Woofers require an enclosure to achieve optimum  
results. The enclosure allows the speaker to operate at lower frequen-  
cies with improved power handling. The two most commonly used  
types of low frequency speaker systems are acoustic suspension and  
bass reflex. The acoustic suspension enclosure, commonly referred  
to as a sealed box, relies upon the changing air pressure in a tightly  
sealed chamber for its operation. The bass reflex, commonly referred  
to as a ported enclosure, uses a vent inserted into the box which takes  
over for the speaker at a desired tuned frequency which is determined  
by the internal volume of the enclosure and the size of the vent used.  
The Punch Power Woofers will yield optimum performance in a  
small, ported enclosure.  
USING TH E PUNCH PO W ER W O O FERS  
Speakers are built in different sizes to optimize their performance in  
different frequency bands. Crossovers are used to route the different  
frequency bands for each speaker. There are two operational types of  
crossover: active and passive. An active crossover is an electronic  
filter which is placed before the amplifier and separates the signal fed  
to different amplifiers in the system. A passive crossover is positioned  
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after the amplifier and separates the signal fed to each speaker in the  
system. Active crossovers offer the accuracy and flexibility needed for  
a sophisticated system and are used in complexmultiple amp designs.  
Passive crossovers (capacitors and inductors) allow the use of mul-  
tiple speakers in a simple system which can easily be expanded over  
time. We recommend using a 6dB per octave, 100Hz low-pass  
crossover for the Punch Power Woofers when used with a passive  
system.  
To customize the installation, try adjusting the crossover point one  
octave up or down to optimize the system staging.  
C A L C U L AT I N G LO A D I M P E D A N C E  
The Punch Power Woofers are used for the sub-bass region, those  
frequencies below 100Hz. This is the foundation for the music and  
the frequency range you feel. Before selecting the passive crossover  
it is necessary to calculate the load impedance of the speaker system.  
In a series circuit the impedance is determined by the formula:  
R = R + R + R + etc.  
t
1
2
3
In a parallel circuit the impedance is determined by the formula:  
1
1
1
1
1
=
+
+
+
+ etc.  
R
R
R
R
R
t
1
2
3
4
Where R is the total speaker load and R , R , etc. represent each  
t
1
2
speaker in the system.  
The crossover is connected in line to the positive terminal of the  
speaker system. The crossovers are available from Authorized Rock-  
ford Fosgate Dealers.  
3
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C ALC U LAT I N G VO LU M E  
Calculating volume is merely a matter of measuring the dimensions  
in inches and using the formula: Volume = Height x Width x Depth.  
The result is in cubic inches, convert this to cubic feet by dividing by  
1,728 (the number of cubic inches in a cubic foot). If two facing sides  
are of uneven length, add them together and divide by two to take the  
average. Using this number will give you the volume without the  
necessity of calculating the box in sections and adding the sections  
together. The thickness of the baffle material reduces the internal  
volume so this must be subtracted from the outside dimensions to  
determine the internal volume. The speaker itself also reduces the  
internal volume. The amount of air displaced by each model is listed  
on the specification sheet and should also be subtracted from the  
gross volume calculation.  
BU I LD I N G AN EN C LO SU RE  
To work properly, the walls of the enclosure must be rigid and not flex  
when subjected to the high pressures generated by the speaker's  
operation. We recommend using 3/4" thick high density particle  
board or medium density fiberboard (MDF), which are available at  
most building supply stores. For a large box, internal bracing is  
needed for reinforcement. The joints should be glued (use non-  
flammable carpenter glue) and secured with either nails or screws.  
Internally the joints should be sealed with silicon to prevent air  
leaking. Because the high density particle board and MDF are porous  
materials, it is suggested to seal the outside enclosure walls with  
polyurethane. Ideally, the port should be located on the same face as  
the speaker and positioned at least one port diameter away from the  
side and back walls.  
In Conclusion  
Special care has been taken to ensure your satisfaction with the  
Punch Power Woofers. The materials and workmanship have been  
carefully selected to guarantee performance equal to the needs of the  
most demanding conditions. If you have any further questions or  
advanced system needs, your Authorized Rockford Fosgate Dealer  
will be happy to assist you.  
4
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5
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W ARRANTY INFO RM ATIO N  
Rockford Fosgate warrants all loudspeakers to the original purchaser for a period  
of two (2) years parts and labor, providing the product was purchased from an  
Authorized Rockford Fosgate Dealer. Speakers found to be defective during the  
warranty period will be repaired or replaced (with a product deemed to be  
equivalent) at Rockford Fosgate’s discretion. Repaired or replaced speakers will  
cover the balance of the original warranty period only. Warranty applies only to  
original purchaser and is non-transferable. Warranty does not cover abuse or  
installation error. If a determination is made that the product has been abused or  
is out of the warranty period, it will be repaired, exchanged, and billed. Parts not  
covered underwarrantywillbe repaired orreplaced and billed. Forspeakerboxes,  
please return the speaker only. Serial number must be intact to obtain warranty.  
Speakers must be returned prepaid to Grand Rapids, Michigan.  
GENERAL  
Electronics and speaker warranties do not cover any appearance item, any cost or  
expense related to the removal or reinstallation of the product, any accessory used  
in conjunction with the product, damage to the product resulting from alteration,  
accident, misuse or abuse, or improper installation. This warranty does not apply  
if the parts or labor, which would otherwise be provided without charge under this  
warranty, are obtained from any source other than Rockford Fosgate or an  
Authorized Rockford Fosgate Service Center.  
The warranty is the only express warranty and does not create any implied  
warranties. Rockford Fosgate limits its obligations under any implied warranties  
under state laws to a period not to exceed the written warranty period. Some states  
do not allow limitation on how long an implied warranty lasts, so the above  
limitation may not apply. This warranty applies only to products sold in the United  
States of America or its possessions. For warranty outside the U.S.A., please  
contact the nearest Authorized Rockford Fosgate Dealer. This warranty gives the  
consumerspecific legalrights, and the consumermayhave otherrightswhich vary  
from state to state.  
A defective product must be shipped prepaid to the Authorized Rockford Fosgate  
Dealer from which the consumer purchased the product or to the address below,  
in the original factory carton or equivalent. Any shipping loss or damage will be  
borne by the consumer or the consumers shipper. A consumer returning a  
product to the factory should call (800) 669-9899 for a Return Authorization  
Number. All shipments shall be clearly marked with the Return Authorization  
Number on the outside of the shipping carton.  
Rockford Fosgate:  
609 Myrtle N.W.  
Grand Rapids, MI 49504 (Receiving-speakers)  
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N O T ES  
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N O T ES  
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Rockford Fosgate  
Rockford Corporation  
546 South Rockford Drive  
Tempe, Arizona 85281 U.S.A.  
In U.S.A., (602) 967-3565  
In Canada, call Korbon (905) 567-1920  
In Europe, Fax (49) 4207-801250  
In Japan, Fax (81) 559-79-1265  
CP-8792-A  
6/94  
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